interrupt.ll
1.75 KB
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; RUN: llc < %s | FileCheck %s
target datalayout = "e-m:e-p:16:16-i32:16-i64:16-f32:16-f64:16-a:8-n8:16-S16"
target triple = "msp430-generic-generic"
@llvm.used = appending global [1 x i8*] [i8* bitcast (void ()* @ISR to i8*)], section "llvm.metadata"
; MSP430 EABI p. 3.9
; Interrupt functions must save all the registers that are used, even those
; that are normally considered callee-saved.
; To return from an interrupt function, the function must execute the special
; instruction RETI, which restores the SR register and branches to the PC where
; the interrupt occurred.
; CHECK: .section __interrupt_vector_2,"ax",@progbits
; CHECK-NEXT: .short ISR
@g = global float 0.0
define msp430_intrcc void @ISR() #0 {
entry:
; CHECK-LABEL: ISR:
; CHECK: push r15
; CHECK: push r14
; CHECK: push r13
; CHECK: push r12
; CHECK: push r11
; CHECK: push r10
; CHECK: push r9
; CHECK: push r8
; CHECK: push r7
; CHECK: push r6
; CHECK: push r5
; CHECK: push r4
%t1 = load volatile float, float* @g
%t2 = load volatile float, float* @g
%t3 = load volatile float, float* @g
%t4 = load volatile float, float* @g
%t5 = load volatile float, float* @g
%t6 = load volatile float, float* @g
%t7 = load volatile float, float* @g
store volatile float %t1, float* @g
store volatile float %t2, float* @g
store volatile float %t3, float* @g
store volatile float %t4, float* @g
store volatile float %t5, float* @g
store volatile float %t6, float* @g
; CHECK: reti
ret void
}
; Functions without 'interrupt' attribute don't get a vector section.
; CHECK-NOT: __interrupt_vector
; CHECK-LABEL: NMI:
; CHECK: reti
define msp430_intrcc void @NMI() #1 {
ret void
}
attributes #0 = { noinline nounwind optnone "interrupt"="2" }
attributes #1 = { noinline nounwind optnone }